Rig Veda
अध॑ द्युता॒नः पि॒त्रोः सचा॒साम॑नुत॒ गुह्यं॒ चारु॒ पृश्ने॑: । मा॒तुष्प॒दे प॑र॒मे अन्ति॒ षद्गोर्वृष्ण॑: शो॒चिष॒: प्रय॑तस्य जि॒ह्वा ॥ अध द्युतानः पित्रोः सचासामनुत गुह्यं चारु पृश्नेः । मातुष्पदे परमे अन्ति षद्गोर्वृष्णः शोचिषः प्रयतस्य जिह्वा ॥
Then, radiant in association with the parents, (heaven and earth), he is awakened (to drink) the agreeable secretion of the cow, and the tongue of the assiduous (performer of holy rites), the resplendent showerer (of benefits), approaching the excellent station of the maternal (cow), seeks to drink the milk.
english translation